Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Feb. 28, 2014 lawsuit	Feb. 28, 2013
Contingent Liabilities [Abstract]
Number of claims	2
Minimum warranty period, days	30 days
Liability associated with guarantee	$ 5.7	$ 4.6

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph (c)(1),(c)(5)

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant